The submitted study organizes the heterogeneous sociological production devoted to the issue of (not only) the industrial working class until 1948. The purpose of such organization of sociological reflection of that period is to show the position of the issue in Czech sociology, to ascertain the main pieces of knowledge on Czech working class before 1948 and to try to assess what from the production of that period can be used also in the current historical-sociological research. The text identifies and classifies the main thematic areas in which the issue of the working class was analysed: the largest consisted in life style research, followed by working class in context of social policy, political context of workers' issue, issue of work as such and business sociology. We see analytical potential in the sociology of social types, developed by I.A. Bláha, sociologist, particularly in the interwar period.